Eureka! That cable worked. Everything seems to work. I can use the screen with the MBP closed. Thanks Marvin and AI members for leading me to the promised land. This seems to resolve another problem I was having on the MBP - a frequent spinning beach ball. I don't know how or why, but I'm grateful that it did. It's like having a brand new computer.
9/24/14 at 8:47am